Merge branch 'remove-padding-fix-7869-v2'

changes/ticket7869

src/feature/dirauth/dirvote.c

src/feature/dirauth/dirvote.h

src/feature/hs/hs_descriptor.c

src/feature/relay/router.c

src/lib/crypt_ops/crypto_curve25519.h

src/lib/crypt_ops/crypto_format.c

src/lib/defs/x25519_sizes.h

src/test/test_crypto.c

src/test/test_dir.c